The torque transmitted by gear is

Question

Two mating spur gears have 40 and 120 teeth respectively. The pinion rotates at 1200 rpm and transmits a torque of 20N.m. The torque  transmitted by gear is          

      (a) 6.6 Nm                                                          (b) 20 Nm

      (c) 40 Nm                                                           (d) 60 Nm